linux-kernel - Re: [PATCH net-next] ipv4: delete sysctls about routing cache

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Date:   Thu, 23 Dec 2021 08:47:02 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     cgel.zte@...il.com
Cc:     davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        prestwoj@...il.com, xu.xin16@....com.cn, zxu@...kedin.com,
        praveen5582@...il.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH net-next] ipv4: delete sysctls about routing cache

On Thu, 23 Dec 2021 12:20:10 +0000 cgel.zte@...il.com wrote:
> From: xu xin <xu.xin16@....com.cn>
> 
> Since routing cache in ipv4 has been deleted in 2012, the sysctls about
> it are useless.

Search for those on GitHub. Useless or not, there is software which
expects those files to exist and which may break if they disappear.
That's why they were left in place.